Spirax Sarco TD42 A, H, L, HA, LA, LCA, S2, S3 Thermodynamic Steam Trap Installation and Maintenance Instructions
Below you will find brief information for Thermodynamic Steam Trap TD42, Thermodynamic Steam Trap TD42A, Thermodynamic Steam Trap TD42H, Thermodynamic Steam Trap TD42L, Thermodynamic Steam Trap TD42HA, Thermodynamic Steam Trap TD42LA. These traps are suitable for pressures up to 42 bar g, complete with integral strainer and screwed body connections. The TD42L and TD42LC are specifically designed for lower capacity applications, ideal for tracing and mains drainage applications. The TD42 and TD42H are specifically designed for higher load applications. The TD42A, TD42HA, TD42LA and TD42LCA are designed for applications where the release of air is a concern. The TD42L, TD42LA, TD42H and TD42HA have electroless nickel preparation (ENP) body surfaces which is both energy saving and oxidation resistant.
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0680150/5
TD42
Thermodynamic Steam Trap
Installation and Maintenance Instructions
IM-P068-24
ST Issue 5
1. Safety information
2. General
product information
3. Installation
4. Commissioning
5. Operation
6. Maintenance
7. Spare parts
2
1. Safety information
Safe operation of this product can only be guaranteed if it is properly installed, commissioned, used and maintained by qualified personnel (see Section
1.11) in compliance with the operating instructions. General installation and safety instructions for pipeline and plant construction, as well as the proper use of tools and safety equipment must also be complied with.
1.1 Intended use
Referring to the Installation and Maintenance Instructions, name-plate and Technical
Information Sheet, check that the product is suitable for the intended use / application.
This product complies with the requirements of the European Pressure Equipment
Directive 97 / 23 / EC and falls within category 'SEP'. It should be noted that products within this category are required by the Directive not to carry the mark. i) This product has been specifically designed for use on steam, air or condensate / water, which is in Group 2 of the above mentioned Pressure
Equipment Directive. The products’ use on other fluids may be possible but, if this is contemplated, Spirax Sarco should be contacted to confirm the suitability of the product for the application being considered.
ii) Check material suitability, pressure and temperature and their maximum and minimum values. If the maximum operating limits of the product are lower than those of the system in which it is being fitted, or if malfunction of the product could result in a dangerous overpressure or overtemperature occurrence, ensure a safety device is included in the system to prevent such over-limit situations.
iii) Determine the correct installation situation and direction of fluid flow. iv) Spirax Sarco products are not intended to withstand external stresses that may be induced by any system to which they are fitted. It is the responsibility of the installer to consider these stresses and take adequate precautions to minimise them.
v) Remove protection covers from all connections and protective film from all name-plates, where appropriate, before installation on steam or other high temperature applications.
1.2 Access
Ensure safe access and if necessary a safe working platform (suitably guarded) before attempting to work on the product. Arrange suitable lifting gear if required.
1.3 Lighting
Ensure adequate lighting, particularly where detailed or intricate work is required.
1.4 Hazardous liquids or gases in the pipeline
Consider what is in the pipeline or what may have been in the pipeline at some previous time. Consider: flammable materials, substances hazardous to health, extremes of temperature.
1.5 Hazardous environment around the product
Consider: explosion risk areas, lack of oxygen (e.g. tanks, pits), dangerous gases, extremes of temperature, hot surfaces, fire hazard (e.g. during welding), excessive noise, moving machinery.
IM-P068-24 ST Issue 5
1.6 The system
Consider the effect on the complete system of the work proposed. Will any proposed action (e.g. closing isolation valves, electrical isolation) put any other part of the system or any personnel at risk?
Dangers might include isolation of vents or protective devices or the rendering ineffective of controls or alarms. Ensure isolation valves are turned on and off in a gradual way to avoid system shocks.
1.7 Pressure systems
Ensure that any pressure is isolated and safely vented to atmospheric pressure.
Consider double isolation (double block and bleed) and the locking or labelling of closed valves. Do not assume that the system has depressurised even when the pressure gauge indicates zero.
1.8 Temperature
Allow time for temperature to normalise after isolation to avoid danger of burns.
1.9 Tools and consumables
Before starting work ensure that you have suitable tools and /or consumables available. Use only genuine Spirax Sarco replacement parts.
1.10 Protective clothing
Consider whether you and /or others in the vicinity require any protective clothing to protect against the hazards of, for example, chemicals, high /low temperature, radiation, noise, falling objects, and dangers to eyes and face.
1.11 Permits to work
All work must be carried out or be supervised by a suitably competent person.
Installation and operating personnel should be trained in the correct use of the product according to the Installation and Maintenance Instructions.
Where a formal 'permit to work' system is in force it must be complied with.
Where there is no such system, it is recommended that a responsible person should know what work is going on and, where necessary, arrange to have an assistant whose primary responsibility is safety.
Post 'warning notices' if necessary.
1.12 Handling
Manual handling of large and/or heavy products may present a risk of injury.
Lifting, pushing, pulling, carrying or supporting a load by bodily force can cause injury particularly to the back. You are advised to assess the risks taking into account the task, the individual, the load and the working environment and use the appropriate handling method depending on the circumstances of the work being done.
1.13 Residual hazards
In normal use the external surface of the product may be very hot. If used at the maximum permitted operating conditions the surface temperature of some products may reach temperatures of 500°C (932°F).
Many products are not self-draining. Take due care when dismantling or removing the product from an installation (refer to 'Maintenance instructions').
IM-P068-24 ST Issue 5 3
1.14 Freezing
Provision must be made to protect products which are not self-draining against frost damage in environments where they may be exposed to temperatures below freezing point.
1.15 Disposal
Unless otherwise stated in the Installation and Maintenance Instructions, this product is recyclable and no ecological hazard is anticipated with its disposal providing due care is taken.
1.16 Returning products
Customers and stockists are reminded that under EC Health, Safety and
Environment Law, when returning products to Spirax Sarco they must provide information on any hazards and the precautions to be taken due to contamination residues or mechanical damage which may present a health, safety or environmental risk. This information must be provided in writing including Health and Safety data sheets relating to any substances identified as hazardous or potentially hazardous.
4 IM-P068-24 ST Issue 5
2. General product information
2.1 General description
The TD42 range are maintainable thermodynamic steam traps which are suitable for pressures up to 42 bar g, complete with integral strainer and screwed body connections.
The TD42L and TD42LC are specifically designed for lower capacity applications and therefore, ideal for tracing and mains drainage applications. Note: ' L' and 'LC' denotes lower capacity.
The TD42 and TD42H are specifically designed for higher load applications.
The
TD42A, TD42HA, TD42LA and TD42LCA are designed for applications where the release of air is a concern. It is supplied with an anti-air-binding disc. Note: the letter ' A' in the nomenclature denotes that an anti-air-binding disc is used in this product.
The TD42L, TD42LA, TD42H and TD42HA have electroless nickel preparation (ENP) body surfaces which is both energy saving and oxidation resistant.
The TD42, TD42A, TD42LC and TD42LCA have black body surfaces.
Please note that both the TD42S2, and TD42S3 are socket weld traps and are covered by separate IMI's. See IM-P068-37 for the
TD42S2, and IM-P068-38 for the TD42S3.
Groove
Groove indentifies
TD42A, TD42LA, TD42LCA and TD42HA versions which have an anti-air-binding disc
TD42 shown anti-air-binding disc
Fig. 1 TD42 and variants
Optional extras
Insulating cover: to prevent the trap being unduly influenced by excessive heat loss such as when subjected to low outside temperatures, wind, rain etc.
Integral blowdown valve: A BDV1 or BDV2 can be fitted to the strainer cap, alternatively the strainer cap can be drilled, tapped and plugged " BSP or NPT.
Standards
These products fully comply with the requirements of the European Pressure Equipment
Directive 97/ 23 / EC.
Certification
This product is available with a manufactures Typical Test Report. Note: All certification / inspection requirements must be stated at the time of order placement.
Note:
For additional information see the following Technical Information Sheets: TI-P068-22,
TI-P151-04 and TI-S01-03.
IM-P068-24 ST Issue 5 5
2.2 Sizes and pipe connections
TD42
TD42A
TD42H
",
½"LC, ½" and ¾" screwed BSP or API
", ½"LC, and ½" screwed BSP (BS 21 parallel) or API
½", ¾" and 1" screwed BSP or NPT
TD42L
TD42HA
TD42LA
TD42LCA
", ½", ¾" and 1" screwed BSP or NPT
½" screwed BSP or NPT
", ½", ¾" and 1" screwed BSP or NPT
½" screwed BSP
2.3 Pressure / temperature limits
(ISO 6552)
���
Pressure psi g
� ��� ��� ��� ��� ��� ��� ��� ��� ���
A
���
���
���
���
�
�
B
��
Steam saturation curve
�� ��
Pressure bar g
�� �� ��
C
��
���
���
���
���
���
���
���
The product must not be used in this region.
For optimum product performance the PMO should not exceed 42 bar g.
A - C TD42L and TD42H
B - C TD42LA and TD42HA
Body design conditions
PMA Maximum allowable pressure
TMA Maximum allowable temperature
Minimum allowable temperature
63 bar g @ 100
400
0 °C
PN63
°C (914 psi g @ 212°F)
°C @ 42 bar g (752°F @ 609 psi g)
(32 °F)
PMO Maximum operating pressure
TMO
Maximum operating temperature
TD42L and TD42H
TD42LA and TD42HA
400
255
42 bar g (609 psi g)
°C @ 42 bar g (752°F @ 609 psi g)
°C @ 42 bar g (491°F @ 609 psi g)
Minimum operating temperature 0 °C (32 °F)
Minimum inlet pressure for satisfactory operation
TD42L and TD42H
TD42LA and TD42HA
0.25 bar g
0.80 bar g
(4 psi g)
(12 psi g)
PMOB Maximum operating backpressure should not exceed 80% of the upstream pressure
Designed for a maximum cold hydraulic test pressure of: 95 bar g (1378 psi g)
6 IM-P068-24 ST Issue 5
3. Installation
Note:
Before actioning any installation observe the 'Safety information' in Section 1.
Referring to the Installation and Maintenance Instructions, name-plate and Technical
Information Sheet, check that the product is suitable for the intended installation:
3.1
Check materials, pressure and temperature and their maximum values. If the maximum operating limit of the product is lower than that of the system in which it is being fitted, ensure that a safety device is included in the system to prevent overpressurisation.
3.2
Determine the correct installation situation and the direction of fluid flow.
3.3
Remove protective covers from all connections and protective film from all name-plates, where appropriate, before installation on steam or other high temperature applications.
3.4
The trap should preferably be installed in the horizontal plane, with a small drop leg preceding it. Suitable isolation valves must be installed to allow for safe maintenance and trap replacement. Consideration should be given to a suitable method for testing the correct operation of the trap. This may be a sight glass or a Spiratec system. Sight glasses must be positioned a minimum of 1 m (3 ft) downstream of any blast-action traps. Where the trap discharges into a closed return system, a non-return valve should be fitted downstream to prevent return flow.
3.5
Isolation valves must be installed to allow for safe maintenance and trap replacement.
3.6
Always open isolation valves slowly until normal operating conditions are achieved - this will avoid system shocks.
3.7
Check for leaks and correct operation.
Note: If the trap is to discharge to atmosphere ensure it is to a safe place, the discharging fluid may be at a temperature of 100
°C (212°F).
Steam
TD42
Steam trap set
Condensate
Fig. 2 Typical application
IM-P068-24 ST Issue 5 7
4. Commissioning
After installation or maintenance ensure that the system is fully functional. Carry out tests on any alarms or protective devices.
5. Operation
The thermodynamic steam trap will discharge condensate with a blast type action at a few degrees below steam saturation temperature, due care must be given to the site of the discharge.
8
6. Maintenance
Note: Before actioning any maintenance programme observe the 'Safety information' in Section 1.
6.1 General information:
Before undertaking any maintenance on the trap it must be isolated from both the supply line and return line and any pressure allowed to safely normalise to atmosphere. The trap should then be allowed to cool.
-
When reassembling make sure that the joint faces are clean.
-
Maintenance can be completed with the trap in the pipeline, once the safety procedures have been observed.
-
It is recommended that new gaskets and spares are used whenever maintenance is undertaken.
-
Ensure that the correct tools and necessary protective equipment are used at all times.
-
When maintenance is complete open isolation valves slowly and check for leaks.
6.2 How to service
Remove the insulating cover ( 7), if fitted, and unscrew the cap (2) using a suitable spanner or socket. Do not use stillsons or a wrench of similar type which may cause distortion of the cap.
-
If the seating faces on the body are only slightly worn, they can be refaced by lapping on a flat surface, such as a surface plate. A figure-of-eight motion and a little grinding compound, such as 'Carborundum Co's Compound I.F.' gives the best results.
If the wear is too great to be rectified by simple lapping, the seating faces on the body must be ground flat and then lapped.
Note: the disc (3) should always be replaced with a new one. The total amount of metal removed in this way should not exceed 0.25 mm (0.010").
-
When reassembling, the disc ( 3) is normally placed in position with the grooved side in contact with the body seating face ( 1).
-
Screw on the cap (
2) to the recommended tightening torque (see Table 1); no gasket is required but a suitable high temperature anti-seize grease should be applied to the threads.
6.3 How to clean or replace the strainer:
Unscrew the strainer cap (
5) using a suitable spanner.
-
Withdraw the screen ( 4) and clean or, if damaged, replace with a new one.
-
To reassemble, insert the screen (
4) into the strainer cap (5), then screw the strainer cap into place. A fine smear of 'Molybdenum Disulphide' grease should be applied to the first few threads. Care should be taken to ensure that the gasket and gasket faces are clean.
-
Tighten to the recommended torque (see Table 1).
-
When maintenance is complete open isolation valves slowly and check for leaks.
IM-P068-24 ST Issue 5
7
2
3
1
4
6
5
Fig. 3
2
5
Table 1 Recommended tightening torques
Item Part Size or mm
36 A /F TD42
TD42 (
( ")
½"LC)
TD42/ TD42H ( ½", ¾")
TD42L
TD42H
( ½", ¾" 1")
(1")
(All)
36 A /F
41 A /F
36 A /F
55 A /F
32 A /F M28
IM-P068-24 ST Issue 5
N m lbf ft
135 - 150 100 - 110
135 - 150 100 - 110
180 - 200 132 - 147
135 - 150 100 - 110
250 - 275 184 - 202
170 - 190 125 - 140
9
7. Spare parts
The spare parts available are shown in solid outline. Parts drawn in broken line are not supplied as spares.
Available spares
Disc (packet of 3)
Disc and strainer screen (TD42LA, TD42HA, TD42A or TD42LCA)
Strainer screen and gasket
Strainer cap gasket (packet of 3)
Insulating cover
3
3, 4, 6
4, 6
6
7
How to order spares
Always order spares by using the description given in the column headed 'Available spares' and state the size and type of trap.
Example:
1 - Strainer screen and gasket for a Spirax Sarco
½" TD42L thermodynamic steam trap.
7
3
Fig. 4
10
4
6
IM-P068-24 ST Issue 5
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12 IM-P068-24 ST Issue 5

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Key features
- Suitable for pressures up to 42 bar g
- Complete with integral strainer
- Screwed body connections
- Designed for lower capacity applications
- Ideal for tracing and mains drainage applications
- Designed for higher load applications
- Designed for applications where the release of air is a concern
- Electroless nickel preparation (ENP) body surfaces
- Energy saving and oxidation resistant